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linuxapi.c  view on Meta::CPAN

{
#ifndef LINUX_API_VERSION
    struct stat st;

    if (stat("/proc/sys/fs/quota", &st) == 0) {
        kernel_iface = IFACE_GENERIC;
    }
    else {
        struct dqstats_v2 v2_stats;
        struct sigaction  sig;
        struct sigaction  oldsig;

        /* This signal handling is needed because old kernels send us SIGSEGV as they try to resolve the device */
        sig.sa_handler   = SIG_IGN;
        sig.sa_sigaction = NULL;
        sig.sa_flags     = 0;
        sigemptyset(&sig.sa_mask);
        if (sigaction(SIGSEGV, &sig, &oldsig) < 0) {
            fprintf(stderr, "linuxapi.c warning: cannot set SEGV signal handler: %s\n", strerror(errno));
            goto failure;
        }
        if (quotactl(QCMD(Q_V2_GETSTATS, 0), NULL, 0, (void *)&v2_stats) >= 0) {
            kernel_iface = IFACE_VFSV0;
        }
        else if (errno != ENOSYS && errno != ENOTSUP) {
            /* RedHat 7.1 (2.4.2-2) newquota check 
             * Q_V2_GETSTATS in it's old place, Q_GETQUOTA in the new place
             * (they haven't moved Q_GETSTATS to its new value) */

linuxapi.c  view on Meta::CPAN

            if ((qf = fopen("/proc/fs/quota", "r"))) {
                if (fscanf(qf, "Version %u", &vers_no) == 1) {
                    if ( (vers_no == (6*10000 + 5*100 + 0)) ||
                         (vers_no == (6*10000 + 5*100 + 1)) ) {
                        kernel_iface = IFACE_VFSV0;
                    }
                }
                fclose(qf);
            }
        }
        if (sigaction(SIGSEGV, &oldsig, NULL) < 0) {
            fprintf(stderr, "linuxapi.c warning: cannot reset signal handler: %s\n", strerror(errno));
            goto failure;
        }
    }

failure:
    if (kernel_iface == IFACE_UNSET)
       kernel_iface = IFACE_VFSOLD;

#else /* defined LINUX_API_VERSION */